Types of social interaction: exchange, competition, conflict, cooperation, accommodation.
Exchange - interacting in an effort to receive a reward or a return for one’s action.
Competition - two or more people or groups are in opposition to achieve a goal that only one can attain.
Conflict - deliberate attempt to control a person by force, to oppose someone, or to harm another person.
Cooperation - two or more people or groups working together to achieve a goal that will benefit more than one of them.
Accommodation - a state of balance between cooperation and conflict.
In sociology, social interaction is a dynamic sequence of social actions between individuals (or groups) who modify their actions and reactions due to actions by their interaction partner(s). Social interactions can be differentiated into accidental, repeated, regular and regulated.
A social interaction is a social exchange between two or more individuals. These interactions form the basis for social structure and therefore are a key object of basic social inquiry and analysis. Social interaction can be studied between groups of two (dyads), three (triads) or larger social groups. - Boundless.com
To learn more, see this Social Structure presentation from www.g-pisd.org.